One of the most inspirational books I know is the Model Car, Truck and Motorcycle Handbook by Robert Schleicher.
Despite it is 1978 vintage, it has a lot of useful tips for the low budget modeller and some photos that must be seen to be believed, especially considering the time it was written.
It's available second hand:
http://www.amazon.com/Model-Car-Truck-Motorcycle-Handbook/dp/0801966264/ref=sr_1_3?s=books&ie=UTF8&qid=1431726589&sr=1-3&keywords=robert+schleicher+model+car